40 CFR § 52.136 - Control strategy for ozone: Oxides of nitrogen.

---
identifier: "/us/cfr/t40/s52.136"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 52.136 - Control strategy for ozone: Oxides of nitrogen."
title_number: 40
title_name: "Protection of Environment"
section_number: "52.136"
section_name: "Control strategy for ozone: Oxides of nitrogen."
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "C"
subchapter_name: "AIR PROGRAMS"
part_number: "52"
part_name: "APPROVAL AND PROMULGATION OF IMPLEMENTATION PLANS"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "42 U.S.C. 7401"
cfr_part: "52"
---


# 52.136 Control strategy for ozone: Oxides of nitrogen.

EPA is approving an exemption request submitted by the State of Arizona on April 13, 1994 for the Maricopa County ozone nonattainment area from the NO<sub>X</sub> RACT requirements contained in section 182(f) of the Clean Air Act. This approval exempts the Phoenix area from implementing the NO<sub>X</sub> requirements for RACT, new source review (NSR), and the applicable general and transportation conformity and inspection and maintenance (I/M) requirements of the CAA. The exemption is based on Urban Airshed Modeling as lasts for only as long as the area's modeling continues to demonstrate attainment without NO<sub>X</sub> reductions from major stationary sources.

[60 FR 19515, Apr. 19, 1995]